Pump for molten metal



Filed June 50, 1927 gm M Dec. 25, 1928.

ll H 1Q A 0 a Patented De 25,1928.

UNITED STATES PATENT o FlcE.

:ISIDOR TORNIBEBG, OF PLAINFIELD, JERSEY, ASSIGNOR TO WOOD NEWSPAPER CHINE-BY CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF VIRGINIA.

PUMP FOR MOLTEN METAL.

Application filed June 30,

This invention relates to a'pump for delivering molten metal to the mold of a casting machine.

The principal object of the invention is to provide means operated automatically in accordance with the level of the metal in the melting pot for controlling the amount of metal discharged by the pump and especially to provide this means in a form in which the amount of metal discharged. will always be constant irrespective of the level of metal in the pot. This is done by causing the stroke of the piston of the pump to be controlled, by the level of the metal in the pot inversely so that it will compensate for the increased discharge normally due to a greater height of metal in the deliver spout 0f the pump.

Other objects and a vantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig; 1 is a central vertical section of a melting pot and pump constructed in accordance with this invention shown with the pisu ton down and the level of the metal in the pump at; a low ,point; Fig. 2 is a view of the means 'for stopping the rise of the piston, showing. that the level. of the liquid in the pump is considerably higher than in Fig. 1; and

Fig. 3 is a plan of the device.- A metal pump for supplying metal to molds, particular 1y stereotype molds, is so constructed usually that the charge of metal pumped on each stroke of the piston varies according to the height of the metal in the melting pot in which. the pump is immersed and therefore in the delivery spout.'- More metal is pumped according to the height of the metal in the pump delivery spout due to the height of the metal in the pot. This invention is made to counteract this effect.

The invention is shown ascomprising a um cylinder 10 located in a melting pot 11 5 1n w ich the metal may rise from a low point as shown in Fig. 1 to a point near the top of the melting pot. I- have shown an ordinary type of piston 12, piston rod 13, lever 14 and operating link 15 connected-with the casting machine to be operated thereby. Of course,

the stroke of the link 15 is always the same regardless of the amount of metal required.

In conditionsheretofore existing, the stroke of the piston 12 has always been the same 1927. Serial No. 262,499.

mountedto swing on this stud and provided with an abutment 23 which is eccentricall mounted. This lever is operated by a lin I 24 and float 25 formed of cast iron or any material lighter than the metal in the pot and not affected by it. It will be observed by comparison of Fig. 1 and Fig. 2 that the height of the float 25 in the melting pot controls the position of the lever 22- and also.

reversely locates the position of the abut-- ment 23. This abutment'is directly over'the screw which'has a projection for engaging the abutment at the upper end of the stroke of the piston. The lever 14 of course goes up to the same height each time'bfit the hand wheel 17 is stopped by the abutment '23 in a higher or lower position acc-oijding to its location at that time. This is possible on acv count of the fact that the collar 19 is slidably mounted on the piston rod and the spring 18 is behind it. The restof the motion of the lever 14 is lost motion.

In Fig. 1 I have shown, in full anddotted lines, substantially the extreme positions in.

which the float 25 and the lever 22 may be located. The amount of metal discharged from the pump through the spout into the mold is controlled by the point at which the movement of the piston is arrested by the abutment 23. As the level of the metal within the spout is always the same as that in the melting pot, it will be seen that when the level'is low it is desirable tocause the piston to move a greater distance than when the level is high, in order to deliver constant charges of metal. The lever 22 and the abutment 23 are proportionedin the same relationship as to leverage as the pro ortion between the area of the pump cham r 10 and the spout 26. Thus the movement of the is-' tonv and its area is in proportion to the di erence in height of the metal within the spout and its area. A constant delivery is assured in this way by the control of the piston by the float in. the metal. This constitutes a only one form of the invention, I am awareof the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore, I do not wish to be limited in these respects, but what I do claim is:

1. In a pump for discharging molten metal, the combination with a melting pot and a pump immersed therein, of means for operating the piston of said pump, a float in the molten metal in the pot, and means connected with said float for stopping the operation of Ehe piston controlled by the elevation of the oat.

2. In a pump for discharging molten metal, the combination with a melting pot, a pump cylinder immersed therein, and a piston in the cylinder, a piston rod, of means for operating the piston comprising a lever actuated equal distances on each stroke, a float in the molten metal in the pot, and means connected with said float with which said piston rod contacts thereby stopping the elevation of the piston at a lower elevation when the float is at a higher elevation in the metal.

3. In a pump for discharging molten metal, the combination with a melting pot for con taining the molten metal, a cylinder in the melting pot having an opening communicating with the metal therein, a piston in the cylinder, a piston rod connected with the piston, means for operating the piston rod, a collar movable on the piston rod, a spring behind the collar and between said lever and collar, an adjustable abutment in a position on the piston rod to be engaged as the piston rises to limit the elevation of the piston, a float in the metal in the melting pot, and means for collar and between said lever and collar, an

adjustable hand wheel on the piston rod and an adjustable abutment in a position to be engaged by the hand wheel as the piston rises to limit the elevation of the piston.

5'. In a device for pumping molten metal, the combination with a melting pot for containing the molten metal, of a float in the molten metal, an abutment so connected with the float as to be lowered when the float rises, a" cylinder and piston in the molten metal and means whereby the piston, on its upward stroke, will be stopped by the abutment and its elevation in the cylinder controlled by the position of the abutment,

6, In a device for pumping molten metal, the combination wtih a melting pot for containing the molten metal, of a float in the molten metal, a lever connected with the float to be swung on its pivot by the rise and fall of the float, an abutment on the short arm of the lever, and a. pump in'the molten metal having means for stopping the pump by engagement with the abutment so that the position of the abutment will control the amount of metal discharged.

v In testimony whereof I have hereunto affixed my signature,

ISIDOR TORNBERG. 

